#include <iostream>
#include <fstream>
#include <cstring>
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
int main()
{
    char *cuvant, sir[100];
    int lgmax = 0, nrcuv = 0;
    fin.getline(sir,100);
    cuvant = strtok(sir, " ");
    while(cuvant)
    {
        for(int i = 0; i < strlen(cuvant); i ++)
        {
            if((cuvant[i] >= 'A' && cuvant[i] <= 'Z') || (cuvant[i] >= 'a' && cuvant[i] <= 'z'))
                lgmax ++;
        }
        nrcuv ++;
        cuvant = strtok(NULL, " ");
    }
    fout << lgmax / nrcuv;
    return 0;
}